Update; Changed the .material code, nothing happened.
material wall1
{
technique
{
pass
{
cull_hardware none
cull_software none
texture_unit
{
texture
wall1.png
}
}
}
}
material wall2
{
technique
{
pass
{
cull_hardware none
cull_software none
texture_unit
{
texture
wall2.png
}
}
}
}
material top
{
technique
{
pass
{
cull_hardware none
cull_software none
texture_unit
{
texture top.png
}
}
}
}